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ULN3718 데이터시트 PDF




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부품번호 ULN3718 기능
기능 LOW-VOLTAGE AUDIO POWER AMPLIFIER
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ULN3718 데이터시트, 핀배열, 회로
3718
3718LOW-VOLTAGE AUDIO POWER AMPLIFIER
LOW-VOLTAGE
AUDIO POWER AMPLIFIER
Providing a low-cost, compact alternative to discrete transistor
amplifiers, the ULN3718M integrated circuit is ideal for application
as a headphone driver in portable radios, tape players, and other
battery-operated equipment. The low-power audio amplifier’s wide
Tfrequency response and low noise ensure premium performance.
CThe amplifier will operate (at reduced volume) with supply voltages
as low as 1.8 V without a significant increase in distortion. This feature
Uallows operation with a 3 V battery supply and minimizes concern
Yabout weak batteries. The class-AB audio amplifier has low quiescent
D Lcurrent drain for maximum battery life. This device is rated for opera-
tion with supply voltages up to 9 V.
O NThe ULN3718M audio amplifier is supplied in an 8-pin mini-DIP
R Oplastic package. A copper alloy lead frame gives the amplifier en-
Phanced power dissipation ratings.
ED NCEFEATURES
U Es Wide Operating Voltage Range 1.8 - 9.0 V
IN Rs Low Quiescent Current
s AC Short-Circuit Protection
T Es Low External Parts Count
Fs Low Distortion
N Es 40 dB Voltage Gain
O s Low Noise
ISC R RABSOLUTE MAXIMUM RATINGS
D FOSupply Voltage, VCC . . . . . . . . . . . . . . 10 V
Package Power Dissipation,
PD . . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range,
TA . . . . . . . . . . . . . . . . -20°C to +85°C
Storage Temperature Range,
TS . . . . . . . . . . . . . . . -65°C to +150°C
Always order by complete part number: ULN3718M .




ULN3718 pdf, 반도체, 판매, 대치품
3718
LOW-VOLTAGE AUDIO POWER AMPLIFIER
APPLICATIONS INFORMATION
Selection of power-supply voltage and speaker impedance allows
a designer to choose audio power levels within the allowable package
power dissipation rating for any maximum operating temperature. No
unique precautions are necessary when designing with this device. It
is stable and ac short-circuit immune.
External component selection for this low-power amplifier involves
only two capacitors — one for output coupling and one for feedback
and ripple decoupling. The coupling capacitor value should be selected
to provide the desired low-frequency cutoff with the chosen load
impedance. The decoupling capacitor should be chosen for both
low-frequency audio rolloff and supply-ripple rejection.
Ripple rejection is not practical to calculate due to the large
number of mechanisms involved. A 500 µF capacitor achieves typi-
cally 25 dB rejection at 120 Hz.
The high gain and the high input impedance of the power amplifier
recommend use of this device in many diverse applications. However,
the input stage does have other characteristics that should be taken
into account for best results. The input is referenced to ground for
internal biasing and must be provided with a dc path to ground. A
current of typically 1 µA flows from the input through the volume
control. This produces an IR drop that is multiplied by the closed loop
dc gain of the amplifier and appears as an error in output centering.
This recommends a value of 200 kor less for the volume control;
values of less than 100 kare preferred.
The selection of amplifier load impedance involves more than just
consideration of the desired power output. A low load impedance will
produce the highest power output for any given supply voltage. Higher
impedances will furnish significant reduction in harmonic distortion and
improvement in overall repeatability in power output capacity.
Special steps toward minimizing tendencies towards instabilities
of all types were taken in the design of this device. However, as with
all high-gain circuits, care should be given to printed wiring board
layout to avoid undesirable effects. Inputs and outputs should be well
separated and should avoid common-mode impedances wherever
possible. For best performance, connect low-level input-signal ground
terminals and the decoupling capacitor ground terminal together at pin
3 (signal ground); connect the high-level speaker ground terminal and
the power supply ground terminal together at pin 2 (power ground).
The signal ground and the power ground should be interconnected
at only one point.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000

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부품번호상세설명 및 기능제조사
ULN3718

LOW-VOLTAGE AUDIO POWER AMPLIFIER

Allegro MicroSystems
Allegro MicroSystems

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